颤振:如何使用ffmpeg从视频中读取数据

Question

我正在尝试使用 lib https://pub.dev/packages/flutter_ffmpeg 从视频中获取元数据，

下面的代码不适用于 ffmpeg

Directory appDocDir = await getApplicationDocumentsDirectory();
String appDocPath = appDocDir.path;
File file = File('{$appDocPath}/folder_name/out.mp4');
final FlutterFFprobe _flutterFFprobe = new FlutterFFprobe();
_flutterFFprobe.getMediaInformation(file.path).then((info) => print(info));

我该如何解决上述问题？

Answer 1

首先需要文件存储访问，然后给定的路径可以访问 ffmpeg lib

添加存储权限

permission_handler: ^5.0.1 // in pubspec.yaml file

在访问视频之前请求运行时权限

var status = await Permission.storage.status;
if (status.isUndetermined) {
// You can request multiple permissions at once.
Map<Permission, PermissionStatus> statuses = await [
Permission.storage,
].request();
print(statuses[Permission.storage]); // this must show permission granted. 
}

最后，将其与具有存储路径的 ffmpeg 一起使用，例如

File file = File('/storage/emulated/0/folder_name/out.mp4');
final FlutterFFprobe _flutterFFprobe = new FlutterFFprobe();
_flutterFFprobe
.getMediaInformation(file.path)
.then((info) => print(info)); // This should print metadata inside of video